Sakura Pigma Micron drawing pen. The first disposable technical pen to use archival pigment ink, the Micron range is favoured artists, writers and illustrators everywhere. PIGMA ink has become the defining standard for reliable, permanent, archival quality ink. Archival quality ink is acid-free, chemically stable, waterproof, and fade resistant. No smears, feathers, or bleed-through on most papers. Strong plastic tip is steel clad for strength and for use against rulers and drawing instruments.